Question

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which four elements are found in every protein? some proteins contain additional elements. hydrogen carbon sulfur nitrogen oxygen phosphorus

Explanation:

Proteins are macromolecules composed of amino - acids. Amino - acids always contain carbon, hydrogen, oxygen, and nitrogen. Sulfur is present in some amino - acids (like cysteine and methionine), and phosphorus is not a common element in proteins.

Answer:

Hydrogen, Carbon, Nitrogen, Oxygen